Packing for plungers



Dec. 2, 1930. y D. R. YARNALL ET AL. 1,783,752

PACKING FOR PLUNGERS Filed Jan. 4, 1927 APatented Dec. 2,' 1930 v UNITEDSTATES PATENT OFFICE DAVID YARNALL AND OSEPH-KIIiDABE, OF PHILADELPHIA,PENNSYLVANIA,

ASSIGNORS TO YARNALL-WARING COMPANY, OF PHILADELPHIA, PENNSYLVANIA,

A CORPORATION F PENNSYLVANIA PACKING FOR PLUNGERS Application ledJanuary 4,

Our invention relates to packing for longitudinally movable shafts, rodsand plungers.V The main purpose' of our invention is to armor or protectthe packing so as to retain it as a compact body against injury. l

A further purpose is to use the compression of a molded ring to forcevout a protective shield against the plunger securing the Aforms amongthe many applications and forms to which it may be suited, selectingconstructions which are practical', efiicientV and inexpensive and whichat the same time well illustrate the principles of the invention.

Figures 1 and 2 are fragmentary longitudinal sections of a valve towhich our invention may be applied.

Figure 3 is a longitudinal section of a pump plunger gland packingfurther illustrating our invention.

Figures 4 and 5 are enlarged sections of slightly different forms of ourpacking.

. In the drawings similar numerals indicate like parts.

We show in Figures 4 and 5 enlarged sections of packing adapted to anyof many different uses'. It comprises a non-metallic annular body 5 uponwhich is or are secured metallic facing 6 or metallic facings 6. 62covering a part of the interior by a shell or shield 7 and a part or allof a transverse face 8 or 8. In Figure 5 two facings 6, 62 are shown.

1927. Serial No. 159,006.

state that we have secured good results with a molded body composedlargely of asbestos with small amounts of graphite and rubber and aMonel metal shield.

We show the packing as applied to two types of valve and to a pumpplunger, selecting these illustrations as typical of varied packingneeds.

In Figure 1 the body 10 is provided withv upper packing 11 and lowerpacking 12 held in place by a shell ring 13 above the packing and aliner 14 below. The packing is compressed by any suitable means, hereshown as the yoke 15 -secured to the body as by bolts 16. Both packingsmay to advantage be of our novelvform.

The body is supplied with inlet 17 and outlet 18 and the inlet 17 leadsinto a channel 19 about the lining so that a plurality of openings 20permit passage of inlet fluid to the interior of the valve. The yokemount-s a threaded stem 21 held against longitudinal movement within theyoke and turned by wheel 22. The stem operates the plunger 23comprising, effectively in the illustration a plug 24 anda sleeve 25.The sleeve 25 is apertured at 26 so. as, in open position, to transmitwater, steam and dirt from the inlet to the interior of the plunger, andhenceto the outlet.

The upper packing is constantly engaging the uniform plunger surface andis subject to no special wear or injury. The lower packing is much moreseverely used.

As will be seen in the illustration, closing movement of the plungerwill cause the lower portions of the openings 26 to expose the lowerpacking before the upper part of the openil'lgs ceases to register inpart with the openings 20. as a result. of which the lower packing willbe exposed to a considerable blast of fluid from the time ut which thisexposure of the packing starts until the openings in the plunger ceaseto register at all with the effective openings in the valve body. Thiscauses a very considerable erosion due to impact of water, steam anddirt against the lower packing. y

In the form shown in Figure 2 the saine reference characters have beenapplied to parts corresponding to those in Figure l but distance.parallel to the axis between the openings 15 and the packing so thatinlet of Hui-d is shut off at all times when the packing is exposed.However, vpassage of the openings in the plunger over the packing hereas in Figure l results in excessive mechanical wear of the packing.

The two shells 6 and 62 are duplicates, protecting opposite faces of thepacking and comprising forms against which or by which the non-metallicmaterial is compressed. These forms are effective even with differentshape of the seats by which the packing ring is engaged, but areintended to cooperate With seats of the same shape.

This construction noty only permits the packing to be put in place witheither face out but permits it to be used in one position and thenreversed in position if desired.

In Figure 3 the packing surrounds the plunger 27 of a pump. It rests inan annular recess 28 Where it is compressed by gland 29 held by bolts30.

In both forms of our invention the corners 3l of the packing arechamfered to fit a cor- 2. An annular packing for packing a lonmoldedring of non-metallic material in combination with a shell of metalcovering a part only of the inner cylindrical surface of the ring andextending over part of the fiat annular surface of the ring, the innercylin drical surface of the shell and the inner cylindrical surface ofthe packing not covered by the shell being iush one with the other, andthe end of the inner cylindrical surface of the shell adjoining theextension over the fiat annular surface of the molded ring being taperedoutwardly and toward the extension to force the flat annular surface ofthe metallic ring inwardly when the packing is cornpressed.

DAVID ROBERT YARNALL.

JOSEPH KILDARE.

responding cross section of recess and the ring is correspondinglychamfered at 3l.

The'tapered lip 32 of the lower end of the shell 7 of the form in Figure4 presses l the shell inwardly With compression upon the' combined'packing in an axial direction. At the same time the compression of thebody 5 of the packing tends to squeeze the packing out into'tightercontact with the plunger Where the nonmetallic packing is exposed so asto prevent seepage past the packing.

It will be obvious that the armor or protective shell is advantageousnot only for the actual physical protection against fluid or mechanicalerosion but also because it secures the combined effects of metallic andnon-metallic packing.

In view of our invention`and disclosure valuations and modifications tomeet individual whim or particular need will doubt` less become evidentto others skilled in the art, to obtain part or all of the benefitsrofour invention Without copying the structures shown, and We, therefore,claim all such in so far as they fall Within the reasonable spiritgraphite and rubber in comr

